finaly, after long long delay, I got my UDOO BOLT V8 amd ryzen board, it was a kickstarter project, founded beginning 2018.
this very little board runs vmix with WIN10 very well, it has also an arduino leonardo board included, you can find details if you google the name.
tested with vmix 4k, two hdmi outs, running 1080i25, recording, sdi via blackmagic m.2 card.

AMD RYZEN EMBEDDED V1605B
QUAD CORE/EIGHT THREAD @2GHZ (3.6 BOOST)
memory 2X SLOT SO-DIMM DUAL CHANNEL 64-BIT DDR4 2400 MT/S WITH ECC SUPPORT UP TO 32GB
graphics AMD RADEON VEGA 8 GRAPHICS (8 GPU CU)

it has a 32GB emmc storage on board and a half length m.2 2242 port and a full lenght 2280 m.2
i was putting in a Transcend 430S SSD (256GB, M.2 2242), both emmc and the ssd are reading/writing only with 250-300MB/s